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Unformatted text preview: Killough, Ian Homework 8 Due: Nov 14 2006, 4:00 pm Inst: Donna C Lyon 1 This printout should have 20 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. This HW assignment is due Tuesday, November 14, by 4:00PM. 001 (part 1 of 3) 10 points Make the following assumptions: 1) The density of liquid water at 100 C is 1.00 g/mL; 2) the vapor is adequately described by the ideal gas equation; 3) the external pressure is constant at 1.00 atm; and 4) the heat of vaporization of water is 2.26 kJ/g. What is q for the vaporization of 1.00 g of liquid water at 1.00 atm and 100 C, to the formation of 1.00 g of steam at 1.00 atm and 100 C? 1. q = 3 . 24 kJ 2. q = 0 . 126 kJ 3. q = 0 kJ 4. q = 1 . 67 kJ 5. q = 2 . 26 kJ correct Explanation: m = 1.00 g H vap . = 2.26 kJ/g q = 2 . 26 kJ g (1 g) = 2 . 26 kJ 002 (part 2 of 3) 10 points What is w for this process? 1. w = 1 . 70 J 2. w = 1 . 70 L atm correct 3. w = +1 . 70 L atm 4. w = +1 . 70 J Explanation: P = 1 atm T = 100 C + 273 = 373 K density = 1 g/mL W = P V V i = (1 g) 1 mL 1 g 1 L 1000 mL = 0 . 001 L V f = n R T P = . 082058 L atm 1 mol K 373 K atm (1 g) 1 mol 18 g = 1 . 701 L w = (1 atm)(1 . 701 . 001)L = 1 . 70 L atm 003 (part 3 of 3) 10 points What is E for this process? 1. E = 2 . 43 kJ 2. E = 2 . 09 kJ correct 3. E = 0 . 56 kJ 4. E = 1 . 29 kJ Explanation: E = q + w = 2 . 26 kJ +  1 . 70 L atm 101 . 33 J L atm 1 kJ 1000 J = 2 . 09 kJ 004 (part 1 of 1) 10 points Calculate the quantity of energy required to change 3.00 mol of liquid water at 100 C to steam at 100 C. The molar heat of vaporiza tion of water is 40.6 kJ/mol. 1. 13.5 kJ 2. 40.6 kJ 3. 122 kJ correct Killough, Ian Homework 8 Due: Nov 14 2006, 4:00 pm Inst: Donna C Lyon 2 4. None of these 5. 300 kJ Explanation: n = 3.0 mol 40 . 6 kJ mol 3 mol = 121 . 8 kJ 005 (part 1 of 1) 10 points How much heat is required to vaporize 50.0 g of water if the initial temperature of the water is 25.0 C and the water is heated to its boiling point where it is converted to steam? The specific heat capacity of water is 4 . 18 J ( C) 1 g 1 and the standard en thalpy of vaporization of water at its boiling point is 40 . 7 kJ mol 1 ....
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This note was uploaded on 04/13/2008 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.
 Spring '07
 Fakhreddine/Lyon

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